04

UG-118 PART UG — GENERAL REQUIREMENTS UG-119

the requirements of (b)(1) or (2) below are met, suchstamping shall not be used on vessels constructed of steelplates less than 1⁄4 in. (6 mm) thick or of nonferrous platesless than 1⁄2 in. (13 mm) thick but may be used on vesselsconstructed of thicker plates. The character size may bereduced as shown below for small diameter vessels withspace limitations.

Nominal Outside Vessel Diameter Character Size,Min., in. (mm)Min., in. (mm) Max., in. (mm)

. . . 31⁄2 (89) 1⁄8 (3)>31⁄2 (89) 41⁄2 (114) 3⁄16 (5)

>41⁄2 (114) 65⁄8 (168) 1⁄4 (6)

UG-118(b)(1) For ferrous materials:(a) the materials shall be limited to P-No. 1 Gr.

Nos. 1 and 2;(b) the minimum nominal plate thickness shall

be 0.1875 in. (5 mm), or the minimum nominal pipe wallthickness shall be 0.154 in. (4 mm);

(c) the minimum design metal temperature shallbe no colder than −20°F (−29°C);

UG-118(b)(2) for nonferrous materials:(a) the materials shall be limited to aluminum as

follows: SB-209 Alloys 3003, 5083, 5454, and 6061;SB-241 Alloys 3003, 5083, 5086, 5454, 6061, and 6063;and SB-247 Alloys 3003, 5083, and 6061;

(b) the minimum nominal plate thickness shallbe 0.249 in. (6.30 mm), or the minimum nominal pipethickness shall be 0.133 in. (3.38 mm).

UG-118(c) The stamping shall be arranged substan-tially as shown in Fig. UG-118 when space permits andshall be located in a conspicuous place on the vessel [seeUG-116(i)].

UG-119 NAMEPLATES

(a) Nameplates shall be used on vessels except whenmarkings are directly applied in accordance with UG-118.Nameplates shall be metal suitable for the intended ser-vice and shall bear the markings called for in UG-116.The marking arrangement shall be substantially as shownin Fig. UG-118. Required nameplates shall be located ina conspicuous place on the vessel [see UG-116(j)].

(b) The nameplate thickness shall be sufficient to resistdistortion due to the application of the marking and to becompatible with the method of attachment. The nameplatenominal thickness shall not be less than 0.020 in.

(c) Nameplates may have markings produced by eithercasting, etching, embossing, debossing, stamping, orengraving, except that the Code Symbol shall be stampedon the nameplate.

(1) The required markings on a nameplate shall bein characters not less than 5⁄32 in. (4 mm) high, except

85

Certified by

(Name of Manufacturer)

psi (kPa) at °F (°C)Max. allowable working pressure

psi (kPa) at °F (°C)Max. allowable external working pressure

[if specified; see Note (1)]W (if arc orgas welded) °F (°C) at psi (kPa)

Min. design metal temperatureRT (if radiographed)HT (if postweld

heat treated) Manufacturer’s serial number

Year built

GENERAL NOTE: Information within parentheses is not part ofthe required marking. Phrases identifying data may be abbreviated;minimum abbreviations shall be MAWP, MDMT, S/N, and year,respectively.

NOTE:(1) The maximum allowable external working pressure is required

only when specified as a design condition.

FIG. UG-118 FORM OF STAMPING 04

that characters for pressure relief device markings maybe smaller.

(2) Characters shall be either indented or raised atleast 0.004 in. (0.10 mm) and shall be legible andreadable.

(d) The nameplate may be marked before it is affixedto the vessel, in which case the Manufacturer shall ensurethat the nameplate with the correct marking has beenapplied to the proper vessel, and the Inspector shall satisfyhimself that this has been done.

(e) The nameplate shall be attached to the vessel orto a pad, bracket, or structure which is welded, brazed,or soldered directly to the vessel. The nameplate shall belocated within 30 in. (760 mm) of the vessel. Removalshall require the willful destruction of the nameplate, orits attachment system. (See M-3.)

(1) Nameplates may be attached either by welding,brazing, or soldering.

(2) Nameplates may be attached by tamper-resistantmechanical fasteners of suitable metal construction.

(3) Nameplates may be attached with pressure-sen-sitive acrylic adhesive systems provided that, in additionto the requirements of this paragraph, those of Appendix18 are met.

(f) An additional nameplate in accordance with (a)through (d) may be installed on the skirt, supports, jacket,or other permanent attachment to a vessel. All data onthe additional plate, including the Code Symbol, shall be

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